As a Jarhead, you'll have to excuse my ignorance of AF TLAs, but I expect that PIT is pilot instructor training. My assumption is that you are a military rated pilot, not a nav. If you're a Nav, you're out of luck.
Rules for military competency relate to any miltary rated pilot. They're in 14 CFR 61.73. Link:
http://a257.g.akamaitech.net/7/257/2422/12feb20041500/edocket.access.gpo.gov/cfr_2004/janqtr/pdf/14cfr61.73.pdf
I'll assume that you are on flight orders, have flown in the last 12 months, have accumulated at least 10 hours PIC time in the last 12 months, have a current aircraft commander rating, and have a current instrument check within the last 12 months.
You need to:
- Get a study guide (I used the ASA commercial book because it had the commercial questions that appear on the mil comp test listed in the back for easy reference). Study it for a few days. Don't think you can do well without this prep, there are a lot of commercial regs you know nothing about.
- Go to an FAA affiliated test center and take the test. You can get reimbursement from the VA for the cost of taking the test if the $15 bucks is important to you.
-Take the original test result form, your logbook showing 10 hours PIC time in the category and class aircraft you're applying for, your records showing your current instrument check and aircraft commanders rating (within the last 12 months), your military ID card, orders showing that you are a military rated pilot or some AF form that shows you are a military rated pilot, and your shiny self down to the local FSDO.
You will receive an FAA certificate showing what category and class aircraft you are eligible to fly. My first visit I received helicopter and multi-engine airplane land, and helo and airplane instrument. I got a T-34 NATOPS check and 10 hours PIC and added single engine airplane land on a subsequent visit.
If you're flying a military aircraft that has an equivalent type rating on the civilian side, they'll add that in as well.
Remember that you need an FAA medical appropriate to the type of civilian flying you wish to perform before you can exercise the priviledges of your new license. I additionally urge you to get instruction from a CFI in any civilian aircraft you wish to fly in. Most likely no one will rent you one without a checkout, but before you borrow your buddy's 152 to run the wife around the pattern, make sure you know how to fly the dang thing.
Good luck.